NO. 2063. NORTH AMERICAN PARASITIC C0PEP0D8— WILSON. 673 



the base of the neck; opposite this bulla are the maxillary glands in 

 the form of a club-shaped projection on either side, pointing diago- 

 nally outward and ventrally; maxiUipeds with a triangular basal 

 joint and a long and stout tennmal claw, bent abruptly near the 

 tip and armed there on the inner margin ^vith an accessory spine. 



Color (preserved material), a uniform yellowish-white. 



Cephalothorax, 2.75 mm. long, 1 mm. ^vide. Trunk, 1.75 mm. 

 long, including the genital process, 2.1 mm. wide. Egg strings, 3 

 mm. long. 



Specific cliaracters of male. — General body form, egg-shaped, quite 

 pointed at the smaller end and evenly rounded at the larger end- 

 first antennae two- jointed, well supplied with setae; second antennae 

 indistinctly three- jomted, with two short setae at the tip; these 

 antennae reach about to the center of the mouth tube, which is broad 

 at the base, proportionally long, and inclined at an angle of 45° 

 with the body axis; first maxillae bipartite at the tip, mth a third 

 ramus on the imier margm; second maxillae and maxiUipeds of the 

 usual pattern. Just behind the second maxillae a drop of the cement 

 substance, which forms the covering of the spermatophores, has 

 exuded from the genital orifice and hardened in the preservative. 



Color (preserved material), a imiform yellowish- white. 



Total length, includmg the mouth tube, 0.57 mm. Width, 0.33 mm. 



(perfidus, deceitful, aUuding to the apparent segmentation at the 

 base of the neck, the external maxUlary glands, and the apparent 

 genital process on the male.) 



RemarJcs.~The first two of the peculiarities just mentioned wiU 

 serve to distinguish this species from all others of the genus, and 

 as the Alaska fish become better known this parasite is likely to be 

 found more abundantly. 



CLAVELLA INVERSA Wilson. 

 Clavella iiiversa Wilson, 1913, p. 231, pi. 50. 



Host and record of specimens. — SLx females with egg strings were 

 obtained from the gills of the red-mouthed grunt, Batliystoma^rimator 

 July 18, 1910, at Montego Bay, Jamaica. The type-specimen was 

 numbered 43513, U.S.N.M., while the paratypes were numbered 

 42291, U.S.N.M. A single adult female was taken by Dr. Edwin 

 Linton from the giUs of a croaker, Micropodon undulatus, at Beau- 

 fort, N. C, August 20, 1902. It is numbered 39610, U.S.N.M. 



Remarks.~T\iQ host of this species is abundant along the Atlantic 

 coast of the Southern States, particularly the Carolinas, where it is 

 one of the common food fishes. Probably, therefore, an examina- 

 tion of these fishes in the markets or elsewhere would reveal a greater 

 number of the parasites. The species may be recognized by the 

 genital process, and by the distinctly undersized appearance of the 

 34843°— Proc.N.M. vol.47— 14 43 



